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JAEA Reports

A Study on laser welding of ferritic/martensitic steel (PNC-FMS) for fast reactor fuel assemblies

Kono, Fumiaki; Sogame, Motomu; Yamada, Tomonori; Shobu, Takahisa; Naganuma, Masayuki; Ozawa, Takayuki; Muramatsu, Toshiharu

JAEA-Technology 2015-004, 57 Pages, 2015/03

JAEA-Technology-2015-004.pdf:20.87MB

Laser welding of ferritic/martensitic steel (PNC-FMS) sheets with different thicknesses (2 mm and 5 mm) was examined to investigate the weldability between the inner and outer duct in fast reactor fuel assemblies with inner duct structure (FAIDUS); the objective of the inner duct is to avoid the re-criticality in case of the core melting accident. Laser-spot and melt-run welding was performed at various laser powers, welding times and velocities to find out the appropriate welding conditions with few defects and enough penetration depth. As for the spot welding, furthermore, slow cooling rate or pulsed laser irradiation could reduce the crack and porosity in the welded zone. The strain of the welded zone almost disappeared and the hardness was comparable with that of the base metal by applying post welding heat treatment at 690 $$^{circ}$$C for 103 min. In addition, the shear strength of welded joints was confirmed to be sufficiently higher than the provisional allowance shear stress. These results indicate that laser welding would be probably applied to the PNC-FMS inner and outer ducts.

Journal Articles

Evaluation of creep damage and diametral strain of fast reactor MOX fuel pins irradiated to high burnups

Uwaba, Tomoyuki; Sogame, Motomu; Ito, Masahiro*; Mizuno, Tomoyasu; Donomae, Takako; Katsuyama, Kozo

Journal of Nuclear Science and Technology, 47(8), p.712 - 720, 2010/08

 Times Cited Count:6 Percentile:43.83(Nuclear Science & Technology)

In determining lifetime criteria of fast reactor fuel pins, creep damage due to fission gas pressure on mixed-oxide fuel pins with austenitic stainless steel cladding successfully irradiated to high burnups (120 GWd/t or higher pin averaged burnup) was evaluated. The degree of creep damage of these fuel pins was expressed as cumulative damage fractions (CDFs), defined so that cladding breaching occurs when the CDF exceeds 1.0. The obtained CDFs for typical high temperature fuel pins were on the order of 10$$^{-4}$$-10$$^{-2}$$ at the end of irradiation, indicating that these fuel pins had large safety margins against breaching due to creep damage. In order to investigate the factors that govern the lifetime of fuel pins, pin diametral increase as well as CDF were predicted in cases of extended burnups from 120 GWd/t onward, and then were compared with tentatively determined limit values. The predicted pin diametral increase reached its limit value earlier than the CDF because of a significant increase in the cladding void swelling, suggesting that lifetimes of fuel pins with austenitic stainless steel cladding are practically governed by the diametral increase rather than by the creep damage.

Oral presentation

Anneal effect of internal strain in steel material with laser welding

Shobu, Takahisa; Zhang, S.; Shiro, Ayumi; Muramatsu, Toshiharu; Yamada, Tomonori; Ogawa, Takemitsu; Ozawa, Takayuki; Sogame, Motomu

no journal, , 

no abstracts in English

Oral presentation

A Study on laser welding of ferritic/martensitic steel for fast reactor fuel assemblies

Kono, Fumiaki; Sogame, Motomu; Yamada, Tomonori; Shobu, Takahisa; Ozawa, Takayuki; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Modeling of gap conductance for fast reactor fuels

Sogame, Motomu; Tanaka, Kenya

no journal, , 

no abstracts in English

Oral presentation

Irradiation behavior of sodium bonded type control rod in the fast reactor, 3 Visual inspection and profilometry results of absorber pins

Sasaki, Shinji; Ishimi, Akihiro; Katsuyama, Kozo; Maeda, Koji; Sogame, Motomu

no journal, , 

no abstracts in English

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